Tim Steffens results 22
· Newest (Page 1/1, per page 25)
Author: Tim Steffens ×Clear All Filters
Search Results
Marine megafauna species are affected by a wide range of anthropogenic threats. To evaluate the risk of such threats, species’ vulnerability to each threat must first be determined. We build on the existing threats classification scheme and ranking system of the International Union for Conservation of Nature (IUCN) Red List of Threatened Species by assessing the vulnerability of 256 marine megafauna species to 23 at‐sea threat...
Characterization and differentiation of sublittoral sandbanks in the southeastern North SeaNARA Subscribed
Marine sublittoral sandbanks are essential offshore feeding grounds for larger crustaceans, fish and seabirds. In the southern North Sea, sandbanks are characterized by considerable natural sediment dynamics and are subject to chronic bottom trawling. However, except for the Dogger Bank, sandbanks in the southeastern North Sea have been only poorly investigated until now. We used an extensive, multi-annual dataset covering ong...
The objective of the current study is to utilize an innovative method called “change probabilities” for describing fracture roughness. In order to detect and visualize anisotropy of rock joint surfaces, the roughness of one-dimensional profiles taken in different directions is quantified. The central quantifiers, change probabilities, are based on counting monotonic changes in discretizations of a profile. These probabilities,...
Genetic testing and surveillance in infantile myofibromatosis: a report from the SIOPE Host Genome Working GroupNARA Subscribed
Infantile myofibromatosis (IM), which is typically diagnosed in young children, comprises a wide clinical spectrum ranging from inconspicuous solitary soft tissue nodules to multiple disseminated tumors resulting in life-threatening complications. Familial IM follows an autosomal dominant mode of inheritance and is linked to PDGFRB germline variants. Somatic PDGFRB variants were also detected in solitary and multifocal IM lesi...
Divergent drivers of the microbial methane sink in temperate forest and grassland soilsNARA Subscribed
Aerated topsoils are important sinks for atmospheric methane (CH 4 ) via oxidation by CH 4 ‐oxidizing bacteria (MOB). However, intensified management of grasslands and forests may reduce the CH 4 sink capacity of soils. We investigated the influence of grassland land‐use intensity (150 sites) and forest management type (149 sites) on potential atmospheric CH 4 oxidation rates (PMORs) and the abundance and diversity of MOB (wit...
Borehole leakage is a common and complex issue. Understanding the fluid flow characteristics of a cemented area inside a borehole is crucial to monitor and quantify the wellbore integrity as well as to find solutions to minimise existing leakages. In order to improve our understanding of the flow behaviour of cemented boreholes, we investigated experimental data of a large-scale borehole leakage tests by means of numerical mod...
Sex recognition in brown skuas: do acoustic signals matter?NARA Subscribed
Previous1Next